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## Triangles

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**Take a rectangular piece of paper.**Fold it in half**Take a rectangular piece of paper.**Fold it in half Use a ruler to draw a line from the top of the fold to the bottom right hand corner.**Take a rectangular piece of paper.**Fold it in half Use a ruler to draw a line from the top of the fold to the bottom right hand corner. Cut along the line.**How can we prove that line ac is equal to line bc?**By folding along the line of symmetry. If you haven’t tried it, do it now. d b a c**d**b a b This type of triangle, where two sides are equal, has a special name. It is called an ISOSCELES triangle c**d**b a b Stick this triangle into your jotter and name it ISOSCELES triangle. Now use the other two pieces of the rectangle to make another isosceles triangle. c**Your new triangle should look like this.**How do we know it is isoscles?**These are the isosceles triangles.**Write in your jotter how we can describe an isosceles triangle and how we can prove it is isosceles.